No trailers play.  emby 4.8.1.0 If I grab the command line from the emby log (and remove emby specific command line options like timing etc, and run that against the latest ffmpeg from ffmpeg, it creates the proper .ts file.  Windows 7, but as the last time I checked right after the 4.8 upgrade you were still saying windows vista as minimum, which windows 7 meets.  ffmpeg-transcode-c8a8f430-2934-4550-b321-997db13bb20d_1.txt